JP6016935B2 - Plate heat exchanger and refrigeration cycle apparatus equipped with the plate heat exchanger - Google Patents

Description

  The present invention relates to a plate heat exchanger and a refrigeration cycle apparatus including the plate heat exchanger.

  Conventionally, a plurality of heat transfer plates are stacked between two side plates at a predetermined interval, and a first flow path and a second flow path through which a first fluid flows in a space formed between these heat transfer plates. A plate-type heat exchanger in which second flow paths through which fluid flows are alternately formed has been proposed. In addition, in order to improve the heat transfer performance, such a conventional plate type heat exchanger has been proposed in which an inner fin is provided in the flow path. For example, “a plurality of heat transfer plates 1, 1. Are laminated so as to form the first flow paths 2, 2,... And the second flow paths 3, 3,... Adjacent to each other between the heat transfer plates 1, 1,. In the plate heat exchanger configured to perform heat exchange between the first fluid X and the second fluid Y that respectively flow through the second flow paths 3, 3. Inner fins 4, 4,... Are arranged in the first flow paths 2, 2,... And the second flow paths 3, 3,. By the interposition of the inner fins 4, 4... Having a high degree of freedom, the heat transfer between the heat transfer plates 1, 1. There has been so also increases heat transfer area while being accelerated. "Plate heat exchanger that (see Patent Document 1) has been proposed.

  Further, in a conventional plate heat exchanger having inner fins in the flow path, for example, “the core portion 1 of the oil cooler has a plurality of first core plates 5 and second cores having a common basic shape. By alternately laminating the core plates 6, the oil flow paths 7 and the cooling water flow paths 8 are alternately formed between the core plates 5 and 6. The oil flow paths 7 include fin plates 11 respectively. The first core plate 5 has a first protrusion 31 and the second core plate 6 has a second protrusion 32 so as to swell outward as viewed from the oil flow path 7. Are also arranged alternately with respect to the oil flow "(see Patent Document 2).

  In addition, as a conventional heat exchanger in which inner fins are provided in a flow path, one in which two heat transfer plates are formed as one flat tube has been proposed. For example, “a flat portion 1a of a flat tube 1” A plurality of inclined grooves 7 for the flow of condensed water that are inclined with respect to the longitudinal direction are formed so that their downstream ends reach the curved surface portion 1b of the tube, and a ridge 7a is formed on the outer surface side of the flat tube 1. And an inner fin 6 is inserted into the flat tube 1 "(Patent Document 3).

JP 2003-185375 A (summary, FIG. 1) JP 2011-007410 A (summary, FIG. 9) JP 2003-294382 A (summary, FIG. 2)

For example, when the first fluid (for example, refrigerant) condenses from vapor to liquid in the channel provided with the inner fins, that is, the second refrigerant (for example, water) that flows through the channel adjacent to the channel through which the first fluid flows. ) Is heated with the first fluid, the heat exchangers described in Patent Documents 1 to 3 have the following problems.
The plate-type heat exchanger described in Patent Document 1 has a flat (flat) range facing (contacting) the heat transfer surface of the heat transfer plate and the heat transfer surface of the inner fin. For this reason, the liquid film of the condensate is likely to be formed in the flow path through which the first fluid flows in a range facing (in contact with) the heat transfer surface of the heat transfer plate and the heat transfer surface of the inner fin. For this reason, there is a problem that this liquid film becomes a thermal resistance and the heat transfer rate from the first fluid to the second fluid is lowered.

  On the other hand, the plate-type heat exchanger described in the cited document 2 has ridges (ridges 31 and 32) formed on the heat transfer surface of the heat transfer plate. Also, an inclined groove (inclined groove 7) is formed on the heat transfer surface of the flat tube. For this reason, these heat exchangers form a liquid film in a range opposite to (in contact with) the heat transfer surface of the heat transfer plate and the heat transfer surface of the inner fin as compared with the plate heat exchanger described in Patent Document 1. It can be suppressed. However, the plate-type heat exchanger described in the cited document 2 has the ridge portion formed perpendicular to the flow direction of the first fluid, so that the liquid condensate of the condensate held by the ridge portion is low. bad. For this reason, the plate-type heat exchanger described in the cited document 2 has a problem that the condensate staying in the ridge portion becomes a thermal resistance, and the heat transfer rate from the first fluid to the second fluid decreases. there were. Further, in the heat exchanger described in the cited document 3, the inclined groove is inclined with respect to the flow direction of the first fluid, and is formed intermittently. For this reason, in the heat exchanger described in the cited document 3, the condensate retained in the inclined groove tends to stay, and the staying condensate becomes thermal resistance. Therefore, similarly to the plate heat exchanger described in Patent Document 2, the heat exchanger described in the cited document 3 has a problem that the heat transfer rate from the first fluid to the second fluid decreases. It was.

  The present invention has been made to solve the above-described problems, and can suppress a decrease in heat transfer coefficient due to the formation of a liquid film of the condensate, and a decrease in heat transfer coefficient due to the stay of the condensate. It is an object of the present invention to obtain a plate-type heat exchanger that can also suppress the refrigeration cycle apparatus including the heat exchanger.

The plate heat exchanger according to the present invention includes a plurality of heat transfer plates each having a flat heat transfer surface formed between two side plates at a predetermined interval, and the side plates and the heat transfer are stacked. In the space formed between the plates and between the heat transfer plates, the first fluid inlet and outlet and the second fluid inlet and outlet different from the first fluid alternately The first flow path through which the first fluid flows and the second flow path through which the second fluid flows are alternately formed, and at least the first flow path is in a range facing the heat transfer surface. A plate-type heat exchanger provided with inner fins, wherein an installation range of the inner fins in the first flow path includes a range facing the heat transfer plate in the inner fins, and the heat transfer plate At least one of the Serial inner fin and small depth of the groove than the thickness of the heat transfer plate are formed along the flow direction of the first fluid, at least a portion of said groove is in the inner fin It is formed by the formed through groove and the bottom concave groove formed in the portion of the heat transfer plate facing the through groove .

  The refrigeration cycle apparatus according to the present invention includes the plate heat exchanger according to the present invention.

  In the present invention, for example, when the first fluid (for example, refrigerant) condenses from vapor to liquid in the first flow path provided with the inner fin, the condensed liquid film of the first fluid is held in the concave groove, The fluid condensate film can be concentrated in the groove. For this reason, this invention can suppress that a liquid film is formed in the range facing the heat-transfer surface of a heat-transfer plate, and the heat-transfer surface of an inner fin. Alternatively, the present invention can thin the condensate film of the first fluid formed in a range facing (contacting) the heat transfer surface of the heat transfer plate and the heat transfer surface of the inner fin. Therefore, the present invention can improve the heat transfer rate from the first fluid to the second fluid.

  Moreover, in this invention, the ditch | groove is formed along the flow direction of the 1st fluid. For this reason, the condensate of the 1st fluid currently hold | maintained at the ditch | groove becomes easy to flow downstream, and the spillability of the 1st fluid condensate from a ditch | groove improves. Therefore, in this invention, it can also suppress that the condensate of a 1st fluid retains in a ditch | groove, and the heat transfer rate from a 1st fluid to a 2nd fluid falls.

It is a disassembled perspective view which shows the conventional plate type heat exchanger. It is a perspective view which shows the inner fin provided in the conventional plate type heat exchanger. It is sectional drawing which shows the conventional plate type heat exchanger. It is the V section enlarged view of FIG. It is a principal part enlarged view of the plate heat exchanger which concerns on Embodiment 1 of this invention, and is an enlarged view of the position corresponded to the V section of FIG. It is a perspective view which shows the heat-transfer plate and inner fin of the plate heat exchanger which concern on Embodiment 1 of this invention. It is the W section enlarged view of FIG. It is a perspective view which shows the heat-transfer plate of the plate heat exchanger which concerns on Embodiment 1 of this invention. It is a principal part enlarged view which shows an example of the plate type heat exchanger which concerns on Embodiment 2 of this invention. It is a principal part enlarged view which shows an example of the plate type heat exchanger which concerns on Embodiment 3 of this invention. It is a perspective view which shows the heat exchanger plate of the plate type heat exchanger which concerns on Embodiment 4 of this invention. It is a circuit diagram which shows the refrigerating-cycle apparatus which concerns on Embodiment 5 of this invention.

Embodiment 1 FIG.
The plate heat exchanger 100 according to the first embodiment is provided with an inner fin 6 in the flow path. The plate heat exchanger 100 according to the first embodiment is characterized in that the groove 8 is formed in the inner fin 6 and the groove 9 is formed in the heat transfer plate 7.
In the following, in order to facilitate understanding of the plate heat exchanger 100 according to the first embodiment, first, the conventional general plate heat exchanger 200 (that is, the concave groove 8 according to the first embodiment 8). , 9 is not described. Thereafter, the plate heat exchanger 100 according to the first embodiment will be described in comparison with the conventional plate heat exchanger 200.
In the description of the plate heat exchanger 100 according to the first embodiment and the conventional plate heat exchanger 200, the same reference numerals are given to the configurations that perform the same functions.

FIG. 1 is an exploded perspective view showing a conventional plate heat exchanger. FIG. 2 is a perspective view showing an inner fin provided in the plate heat exchanger. FIG. 3 is a sectional view showing this plate heat exchanger. FIG. 4 is an enlarged view of a portion V in FIG. FIG. 3 is a cross-sectional view taken along a cross section perpendicular to the flow direction of the fluid flowing in the flow path formed between the heat transfer plates. Further, “A” shown in FIGS. 1 and 4 indicates the flow direction of the first fluid, and “B” shown in FIGS. 1 and 4 indicates the flow direction of the second fluid.
First, a conventional plate heat exchanger 200 will be described with reference to FIGS.

For example, the plate heat exchanger 200 includes a heat transfer plate 7 in which a flat (flat) heat transfer surface is formed between two side plates 5 that function to reinforce the plate heat exchanger 200. A plurality of layers are stacked at intervals. The two side plates 5 are formed in a rectangular shape, for example. The one side plate 5 is formed with an inlet 1 for the first fluid, an outlet 2 for the first fluid, an inlet 3 for the second fluid, and an outlet 4 for the second fluid at the four corners. ing. In addition, pipes are connected to the first fluid inlet 1, the first fluid outlet 2, the second fluid inlet 3, and the second fluid outlet 4.
In the following description, for the sake of convenience, the end direction of the side plate 5 will be referred to as the x axis, and the longitudinal direction of the side plate 5 will be described as the y direction.

  The heat transfer plate 7 includes two types of heat transfer plates (a heat transfer plate 7a and a heat transfer plate 7b). The heat transfer plates 7 a and the heat transfer plates 7 b are alternately arranged between the two side plates 5. The heat transfer plate 7a and the heat transfer plate 7b are rectangular like the side plate 5, and the heat transfer surface is formed flat (flat). The heat transfer plate 7a and the heat transfer plate 7b are, like the side plate 5, at the four corners thereof, the first fluid inlet 1, the first fluid outlet 2, the second fluid inlet 3, and The second fluid outlet 4 is formed (hereinafter, the heat transfer plate 7a and the heat transfer plate 7b are collectively referred to as the heat transfer plate 7).

  Further, the heat transfer plate 7a has a shape in which a peripheral edge portion, a first fluid inlet 1 and a first fluid outlet 2 protrude. In other words, the heat transfer plate 7a is configured to separate the flow path through which the second fluid inlet 3 and the second fluid outlet 4 communicate with each other from the first fluid inlet 1 and the first fluid outlet 2. It has become. On the other hand, the heat transfer plate 7b has a shape in which a peripheral edge portion, a second fluid inflow port 3 and a second fluid outflow port 4 protrude. That is, the heat transfer plate 7b has a configuration in which the flow path through which the first fluid inlet 1 and the first fluid outlet 2 communicate with each other and the second fluid inlet 3 and the second fluid outlet 4 are separated from each other. It has become. For this reason, in the state where the side plate 5, the heat transfer plate 7a, and the heat transfer plate 7b are assembled, the first flow path 11 through which the first fluid flows and the second flow path 12 through which the second fluid flows are alternately formed. The Rukoto. As shown in FIGS. 1 and 4, the first fluid flowing through the first flow path 11 flows from the upper side to the lower side in FIG. 1 along the y axis, and flows through the second flow path 12. The fluid will flow from the lower side to the upper side in FIG. 1 along the y-axis. That is, the first fluid and the second fluid are counterflows.

  Further, inner fins 6 are provided in both the first flow path 11 and the second flow path 12 of the plate heat exchanger 200 in a range facing the heat transfer surface of the heat transfer plate 7. The inner fin 6 is formed by cutting and raising a plurality of first cut and raised portions 61 and second cut and raised portions 62 from the substrate portion 6a. Specifically, the first cut-and-raised portion 61 has a U-shaped cross section, and connects the first top surface portion 61a parallel to the substrate portion 6a and both ends of the first top surface portion 61a to the substrate portion 6a. It is formed by two first leg portions 61b. A plurality of first cut-and-raised portions 61 are formed in the x-axis direction at a predetermined interval. The second cut-and-raised portion 62 has a U-shaped cross section, and connects the substrate portion 6a with the second top surface portion 62a parallel to the substrate portion 6a and both ends of the second top surface portion 62a. Two second legs 62b are formed. And the 2nd cut-and-raised part 62 is also formed in multiple numbers by the x-axis direction via the predetermined space | interval similarly to the 1st cut-and-raised part 61. FIG.

  The second cut-and-raised part 62 is offset in the x-axis direction with respect to the first cut-and-raised part 61 so that a part of the second top surface part 62a is connected to a part of the first top surface part 61a. (Hereinafter, the first top surface portion 61a and the second top surface portion 62a are collectively referred to as the top surface portion 6b). The first cut-and-raised portions 61 formed in the x-axis direction at a predetermined interval and the second cut-and-raised portions 61 formed in the x-axis direction at a predetermined interval are A plurality of the surface portions 62a are arranged in the y-axis direction so as to be connected to a portion of the first top surface portion 61a. In other words, the inner fin 6 has a configuration in which a plurality of first leg portions 61b and second leg portions 62b are formed between the substrate portion 6a and the top surface portion 6b.

  In the inner fin 6 configured as described above, the substrate portion 6a faces (joins) one of the heat transfer plate 7a and the heat transfer plate 7b, and the top surface portion 6b and the other of the heat transfer plate 7a or the heat transfer plate 7b. It arrange | positions in the 1st flow path 11 and the 2nd flow path 12 so that it may oppose (joined). That is, the first leg portion 61b of the first cut and raised portion 61 and the second leg portion 62b of the second cut and raised portion 62 are formed in the first flow path 11 and the second flow path 12 along the y-axis direction. It becomes a fin part. For this reason, since the first fluid flowing through the first flow path 11 and the second fluid flowing through the second flow path 12 are agitated by the first leg portion 61b and the second leg portion 62b, the first fluid and the second fluid The efficiency of heat exchange with the fluid is improved.

  However, the plate heat exchanger 200 configured as described above has the following problems.

  In the plate heat exchanger 200, when heat exchange is performed between the first fluid and the second fluid, the heat transfer surface of the heat transfer plate 7, the substrate portion 6a of the inner fin 6, and the top surface portion 6b are connected to the high temperature side. The heat of the fluid is transferred to the low temperature side fluid. For example, when the first fluid that is a high-temperature refrigerant or the like exchanges heat with the second fluid that is a low-temperature water or the like, the heat of the first fluid is the heat transfer surface of the heat transfer plate 7 or the substrate portion of the inner fin 6. The second fluid is transmitted through 6a and the top surface portion 6b. The vapor-like first fluid condenses in the first flow path 11 in the process of giving heat to the second fluid. At this time, in the plate heat exchanger 200, the heat transfer surface of the heat transfer plate 7, the substrate portion 6a and the top surface portion 6b of the inner fin 6 are formed flat, and thus the liquid of the first fluid that has become the condensate. A film is easily formed. For this reason, this liquid film becomes resistance, and the heat transfer rate from the first fluid to the second fluid decreases.

  Therefore, the plate heat exchanger 100 according to the first embodiment includes, as shown in FIGS. 5 to 8 described later, in addition to the configuration of the conventional plate heat exchanger 200, the concave grooves 8 of the inner fins 6 and The groove 9 of the heat transfer plate 7 is provided.

  FIG. 5 is an enlarged view of a main part of the plate heat exchanger according to the first embodiment of the present invention, and is an enlarged view of a position corresponding to the V part in FIG. 3. FIG. 6 is a perspective view showing a heat transfer plate and inner fins of the plate heat exchanger according to the first embodiment. FIG. 7 is an enlarged view of a portion W in FIG. FIG. 8 is a perspective view showing a heat transfer plate of the plate heat exchanger according to the first embodiment. Note that “A” shown in FIG. 5 indicates the flow direction of the first fluid, and “B” shown in FIGS. 1 and 4 indicates the flow direction of the second fluid.

  As shown in FIGS. 5 and 7, the plate heat exchanger 100 according to the first embodiment includes a plurality of concave grooves 8 having a U-shaped cross section in the inner fin 6 provided in the first flow path 11. Is formed. These concave grooves 8 are formed along the y-axis, that is, along the flow direction of the first fluid. The concave grooves 8 are formed on the surface on the first flow path side of the substrate portion 6a and the surface on the first flow path side of the top surface portion 6b. That is, these concave grooves 8 are provided in a range (a range in contact) facing the heat transfer surface of the heat transfer plate 7 in the inner fin 6. In the first embodiment, each of the concave grooves 8 is formed without interruption from the upstream side to the downstream side in the flow direction of the first fluid flowing through the inner fin 6. Further, in the first embodiment, each of the concave grooves 8 is formed in a linear shape.

  Moreover, as shown in FIG.5 and FIG.8, the board | substrate of the inner fin 6 is provided in the 1st flow path 11 side at the heat-transfer surface of the heat-transfer plate 7 of the plate type heat exchanger 100 which concerns on this Embodiment 1. FIG. A plurality of concave grooves 9 having a U-shaped cross section are formed in a range that does not face the portion 6a and the top surface portion 6b (a range that does not contact). These concave grooves 9 are formed along the y-axis, that is, along the flow direction of the first fluid. In the first embodiment, each of the concave grooves 9 is formed without interruption from the upstream side to the downstream side in the flow direction of the first fluid flowing through the inner fin 6. Further, in the first embodiment, each of the concave grooves 9 is formed in a linear shape.

  That is, the concave groove 8 of the inner fin 6 and the concave groove 9 of the heat transfer plate 7 are formed in a range in contact with the first fluid.

  As described above, in the plate heat exchanger 100 according to the first embodiment configured as described above, the first fluid, for example, a process in which the first fluid, which is a vapor-like refrigerant or the like at a high temperature, gives heat to the second fluid. When condensing in the channel 11, the condensed liquid film of the first fluid can be held in the concave grooves 8 and the concave grooves 9, and the condensed liquid film of the first fluid can be concentrated in the concave grooves 8 and the concave grooves 9. Therefore, the plate heat exchanger 100 according to the first embodiment condenses the first fluid on the heat transfer surface of the heat transfer plate 7, the substrate portion 6 a of the inner fin 6, and the top surface portion 6 b in the first flow path 11. The formation of a liquid film can be suppressed. Alternatively, the plate heat exchanger 100 according to the first embodiment is configured such that the first fluid formed on the heat transfer surface of the heat transfer plate 7, the substrate portion 6 a of the inner fin 6, and the top surface portion 6 b in the first flow path 11. The condensate film can be made thinner. Therefore, the plate heat exchanger 100 according to the first embodiment can improve the heat transfer rate from the first fluid to the second fluid.

  Further, in the plate heat exchanger 100 according to the first embodiment, the concave groove 8 and the concave groove 9 are formed along the flow direction of the first fluid. Therefore, the condensate of the first fluid held in the concave groove 8 and the concave groove 9 is likely to flow downstream, and the liquid repellency of the condensate of the first fluid from the concave groove 8 and the concave groove 9 is improved. . Therefore, in the plate heat exchanger 100 according to the first embodiment, the condensate of the first fluid stays in the concave groove 8 and the concave groove 9 and the heat transfer rate from the first fluid to the second fluid decreases. It can also be suppressed.

  Furthermore, in the plate heat exchanger 100 according to the first embodiment, the concave groove 8 and the concave groove 9 are formed without interruption from the upstream side to the downstream side in the flow direction of the first fluid flowing inside the inner fin 6. Has been. For this reason, the spillability of the condensate of the 1st fluid from the ditch | groove 8 and the ditch | groove 9 can further improve, and the heat transfer rate from a 1st fluid to a 2nd fluid can further be improved.

  Furthermore, in the plate heat exchanger 100 according to the first embodiment, since the concave groove 8 and the concave groove 9 are formed in a straight line, the first fluid is condensed from the concave groove 8 and the concave groove 9. The liquid spillability is further improved, and the heat transfer rate from the first fluid to the second fluid can be further improved.

  Furthermore, in the plate heat exchanger 100 according to the first embodiment, the concave groove 9 is smaller than the thickness of the heat transfer plate 7. For this reason, the groove 9 can be formed in the heat transfer plate 7 without causing the heat transfer surface of the heat transfer plate 7 to protrude toward the second flow path 12. Therefore, the joining of the heat transfer plate 7 and the inner fin 6 is not complicated, and the plate heat exchanger 100 can be easily manufactured.

  Here, in the first embodiment, the example in which the second fluid is heated while the high-temperature first fluid is condensed (phase change) has been described. However, in the plate heat exchanger 100 according to the first embodiment, when the low temperature first fluid evaporates and the high temperature second fluid is cooled, and the first fluid is a single phase (liquid phase or gas phase). In the case of exchanging heat with the second fluid in the state of), there is an effect of improving the heat transfer coefficient between the first fluid and the second fluid. Since the first fluid is held in the groove 8 and the groove 9 when the first fluid evaporates, nucleate boiling can be promoted, thereby improving the heat transfer coefficient between the first fluid and the second fluid. It is. Further, when heat exchange is performed with the second fluid while the first fluid is in a single phase (liquid phase or gas phase), the corner portions of the concave groove 8 (the flat portions of the substrate portion 6a and the top surface portion 6b of the inner fin 6). The agitation effect of the first fluid is improved by the boundary between the portion and the groove 8 and the corner of the groove 9 (the boundary between the flat portion of the heat transfer surface of the heat transfer plate 7 and the groove 9). Because. In addition, the said stirring effect is an effect acquired even when the 1st fluid condenses and evaporates.

Embodiment 2. FIG.
The concave groove 8 and the concave groove 9 shown in the first embodiment are formed in a substantially U-shape in which the distance from the opening to the bottom is constant in a cross section perpendicular to the longitudinal direction of these concave grooves. Not only this but the ditch | groove 8 and the ditch | groove 9 may be formed in the following cross-sectional shapes, for example. Note that a configuration not particularly described in the second embodiment is the same as that of the first embodiment, and the same function and configuration are described using the same reference numerals.

FIG. 9 is an enlarged view of a main part showing an example of a plate heat exchanger according to Embodiment 2 of the present invention. FIG. 9 is a cross-sectional view taken along a cross section perpendicular to the longitudinal direction of the groove 8 and the groove 9.
In the cross section perpendicular to the longitudinal direction of the concave groove 8 and the concave groove 9, the concave groove 8 and the concave groove 9 of the plate heat exchanger 100 according to Embodiment 2 have a width that decreases from the opening to the bottom. Is formed. For example, as shown in FIG. 9A, by forming the concave groove 8 and the concave groove 9 in a triangular cross section, the concave groove 8 and the concave groove 9 whose width decreases from the opening to the bottom can be formed. it can. Further, for example, as shown in FIG. 9B, by forming the concave groove 8 and the side surface of the concave groove 9 in a stepped shape, in other words, a concave groove having a width smaller than that of the concave groove at the bottom of the concave groove. By forming the groove 8 and the groove 9, it is possible to form the groove 8 and the groove 9 whose width decreases from the opening to the bottom.

  In FIG. 9B, a through-groove 8a having a square cross section formed in the substrate portion 6a and the top surface portion 6b of the inner fin 6 and a portion facing the through-groove 8a of the heat transfer plate 7 are formed. The concave groove 8 is formed by the bottom side concave groove 8b having a width smaller than that of the groove 8a. Not limited to this, a groove having a width smaller than that of the groove may be formed in the bottom of the groove on the substrate portion 6a and the top surface portion 6b of the inner fin 6, and the groove 8 may of course be used. That is, as a matter of course, the concave groove 8 may be formed by processing only the substrate portion 6 a and the top surface portion 6 b of the inner fin 6. In other words, the concave groove 8 shown in FIG. 9A has a triangular cross section formed in a trapezoidal through groove 8a formed in the inner fin 6 and a portion of the heat transfer plate 7 facing the through groove 8a. Of course, it may be constituted by the bottom side groove 8b. Further, the concave groove 8 shown in the first embodiment is also formed in the through-groove 8a having a square cross section formed in the inner fin 6 and the portion facing the through-groove 8a of the heat transfer plate 7, and the through-groove 8a Of course, it may be constituted by the bottom groove 8b having the same width.

  As described above, the plate heat exchanger 100 configured as in the second embodiment can obtain the following effects as compared with the first embodiment in addition to obtaining the same effects as the first embodiment. You can also.

  In the plate heat exchanger 100 according to the second embodiment, since the concave groove 8 and the concave groove 9 are formed so that the width decreases from the opening to the bottom, the concave groove 8 and the concave groove 9 are held. The amount of condensate to be adjusted can be adjusted. For example, when the first fluid condenses in the first flow path 11, the plate heat exchanger 100 according to the second embodiment has the condensate liquid in the initial stage where the condensate film of the first fluid is formed. The holding amount can be smaller than that in the first embodiment. As the first fluid is condensed, the amount of the condensate retained in the concave groove 8 and the concave groove 9 gradually increases, but this increased amount can be made larger than in the first embodiment.

  Further, as in the second embodiment, by forming the concave groove 8 with the through groove 8a of the inner fin 6 and the bottom side concave groove 8b of the heat transfer plate 7, the through groove 8a and the bottom side concave groove 8b are formed. Since it becomes a mark at the time of aligning the inner fin 6 and the heat transfer plate 7, the assembly accuracy of the plate heat exchanger 100 can be improved, and the reliability of the plate heat exchanger 100 is improved.

  In addition, when the concave groove 8 and the concave groove 9 are formed in a cross-sectional triangle shape as shown in FIG. 9A, the amount of liquid film retained during condensation can be adjusted by the apex angle and side length of the triangle. Further, when the concave groove 8 and the concave groove 9 are formed in a triangular cross section as shown in FIG. 9B, the amount of liquid film retained during condensation can be adjusted by changing the dimensions a and b.

Embodiment 3 FIG.
The shape of the concave groove 8 and the concave groove 9 is not limited to the shape shown in the first embodiment and the second embodiment, and may be formed in the following cross-sectional shape, for example. Note that a structure not particularly described in the third embodiment is the same as that in the first or second embodiment, and the same function or structure is described using the same reference numeral.

FIG. 10 is a main part enlarged view showing an example of a plate heat exchanger according to Embodiment 3 of the present invention. FIG. 10 is a cross-sectional view taken along a cross section perpendicular to the longitudinal direction of the groove 8 and the groove 9.
In the cross section perpendicular to the longitudinal direction of the concave groove 8 and the concave groove 9, the concave groove 8 and the concave groove 9 of the plate heat exchanger 100 according to Embodiment 3 have a width that increases from the opening to the bottom. Is formed. For example, as shown in FIG. 10A, the concave groove 8 and the concave groove 9 are formed in a trapezoidal shape having an opening on the short side, whereby the concave groove 8 having a width that increases from the opening to the bottom. A concave groove 9 can be formed. Further, for example, as shown in FIG. 10B, by forming the side surfaces of the concave groove 8 and the concave groove 9 in a step shape, in other words, the concave groove having a width wider than the concave groove at the bottom of the concave groove. By forming the groove 8 and the groove 9, it is possible to form the groove 8 and the groove 9 whose width increases from the opening to the bottom.

  In FIG. 10B, a through-groove 8a having a rectangular cross section formed in the substrate portion 6a and the top surface portion 6b of the inner fin 6 and a portion facing the through-groove 8a of the heat transfer plate 7 are formed. The concave groove 8 is formed by the bottom side concave groove 8b having a width larger than that of the groove 8a.

  As described above, the plate heat exchanger 100 configured as in the third embodiment can obtain the following effects as compared with the first embodiment, in addition to obtaining the same effects as the first embodiment. You can also.

  In the plate heat exchanger 100 according to the third embodiment, since the concave groove 8 and the concave groove 9 are formed so as to increase in width from the opening to the bottom, the groove is held in the concave groove 8 and the concave groove 9. The amount of condensate to be adjusted can be adjusted. For example, when the first fluid condenses in the first flow path 11, the plate heat exchanger 100 according to the third embodiment has the condensate liquid in the initial stage where the condensate film of the first fluid is formed. The holding amount can be made larger than that in the first embodiment. As the first fluid is condensed, the amount of the condensate retained in the concave groove 8 and the concave groove 9 gradually increases, but this increased amount can be made smaller than in the first embodiment.

  Moreover, the shape of the concave groove 8 and the concave groove 9 which concerns on this Embodiment 3 is a shape which is easy to draw in condensate. For this reason, in the concave groove 8 and the concave groove 9, boiling is easily activated by adjacent bubbles, and therefore, when the plate heat exchanger 100 according to the third embodiment is used under the condition that the first fluid evaporates. The heat transfer coefficient between the first fluid and the second fluid can be improved as compared with the first and second embodiments.

Embodiment 4 FIG.
You may provide the following outlet side concave grooves 9a and inlet side concave grooves 9b at the end of the concave groove 9 shown in the first to third embodiments. Note that a configuration that is not particularly described in the fourth embodiment is the same as that of any of the first to third embodiments, and the same function or configuration is described using the same reference numeral.

FIG. 11 is a perspective view showing a heat transfer plate of a plate heat exchanger according to Embodiment 4 of the present invention.
The heat transfer plate 7 of the plate heat exchanger 100 according to the fourth embodiment has one outlet connected to the concave groove 9 and the other outlet connected to the first fluid outlet 2 in the outlet side concave groove 9a. Is formed.
In addition, the heat transfer plate 7 of the plate heat exchanger 100 according to the fourth embodiment has one end connected to the groove 9 and the other end connected to the inlet 1 of the first fluid. A groove 9b is also formed.

  The first fluid that has flowed through the inner fin 6 is inclined to flow into the outlet 2 of the first fluid. The first fluid that has flowed into the first flow path 11 from the first fluid inlet 1 flows into the inner fin 6 after flowing into the inner fin 6 side. Therefore, the flow path from the first fluid inlet 1 to the inner fin 6 and the flow path from the inner fin 6 to the first fluid outlet 2 are in contrast to the inner fin 6 flow path. The flow path is difficult to flow. However, since the plate heat exchanger 100 according to the fourth embodiment includes the inlet-side concave groove 9b and the outlet-side concave groove 9a, it is difficult to flow with respect to the inner fin 6 flow path. The first fluid can be smoothly flowed by flowing the first fluid along the inlet-side groove 9b and the outlet-side groove 9a. Further, since the first fluid can flow smoothly in the flow path that is difficult to flow with respect to the flow path in the inner fin 6, the effective heat transfer area of the heat transfer plate 7 can also be increased. These effects can be obtained by providing the first fluid only by providing one of the inlet side concave groove 9b and the outlet side concave groove 9a.

  In the first to fourth embodiments described above, the present invention has been described by taking the plate heat exchanger 100 in which the inner fins 6 are provided in the second flow path 12 as an example. Of course, the present invention can be applied to a plate heat exchanger in which the fins 6 are not provided and the inner fins 6 are provided only in the first flow path 11.

  In the first to fourth embodiments described above, the plate-type heat in which the concave groove 8, the concave groove 9, the outlet side concave groove 9a, and the inlet side concave groove 9b are formed only on the first flow path 11 side. Although the present invention has been described by taking the exchanger 100 as an example, the concave groove 8, the concave groove 9, the outlet side concave groove 9a, and the inlet side concave groove 9b may be formed on the second flow path 12 side. The effect obtained on the first flow path 11 side can also be obtained on the second flow path 12 side.

  In the first to fourth embodiments, the plate heat exchanger 100 in which both the concave groove 8 and the concave groove 9 are formed has been described. However, only one of the concave groove 8 and the concave groove 9 is described. Even if formed, the above-mentioned effect can be obtained.

  Moreover, in said Embodiment 1- Embodiment 4, although the 1st flow path and the 2nd flow path demonstrated the plate type heat exchanger 100 used as the counterflow, the 1st flow path and the 2nd flow were demonstrated. Of course, the road may be a parallel flow.

  The plate heat exchanger according to the present invention may be configured by combining the concave grooves 8 and the concave grooves 9 having the shapes shown in the first to third embodiments.

Embodiment 5 FIG.
Finally, an example of the refrigeration cycle apparatus including the plate heat exchanger 100 shown in the first to fourth embodiments will be described.

FIG. 12 is a circuit diagram showing a refrigeration cycle apparatus according to Embodiment 5 of the present invention.
A refrigeration cycle apparatus 150 shown in FIG. 12 is an air conditioner using any of the plate heat exchangers 100 described in the first to fourth embodiments as a refrigerant-to-refrigerant heat exchanger. The refrigeration cycle apparatus 150 includes a heat source side refrigerant circuit 30, a use side refrigerant circuit 40, and the like.

  The heat source side refrigerant circuit 30 includes a compressor 31, a plate heat exchanger 100 serving as a condenser, an expansion valve 33, and an evaporator 32, which are sequentially connected by a refrigerant pipe. The usage-side refrigerant circuit 40 is configured by sequentially connecting a pump 41, a usage-side heat exchanger 42, and a plate heat exchanger 100 through refrigerant piping.

  The vapor-state heat source side refrigerant (for example, the first fluid) compressed by the compressor 31 flows into the plate heat exchanger 100. The heat source side refrigerant that has flowed into the plate heat exchanger 100 condenses by heating the use side refrigerant (for example, the second fluid). The heat source side refrigerant condensed in the plate heat exchanger 100 becomes a supercooled liquid refrigerant and flows into the expansion valve 33. The low-temperature and low-pressure heat-source-side refrigerant expanded by the expansion valve 33 enters a two-phase state with a low dryness and flows into the evaporator 32. The heat-source-side refrigerant that has flowed into the evaporator 32 absorbs heat from the air sent from the blower 32a and evaporates. The heat source side refrigerant evaporated in the evaporator 32 is sucked into the compressor 31 and compressed again.

  On the other hand, the use-side refrigerant heated by the heat exchange with the heat source-side refrigerant in the plate heat exchanger 100 is sucked into the pump 41 and then discharged and flows into the use-side heat exchanger 42. In the use-side heat exchanger 42, the use-side refrigerant heats the air in the air-conditioned space sent out from the blower 42a and heats the air-conditioned space. Thereafter, the use-side refrigerant flows into the plate heat exchanger 100 again.

  Since the refrigeration cycle apparatus 150 configured as described above includes the plate heat exchanger 100 shown in the first to fourth embodiments, the refrigeration cycle apparatus 150 has high energy saving and high reliability.

  In the refrigeration cycle apparatus 150 according to the fifth embodiment, the plate heat exchanger 100 is used as the condenser of the heat source side refrigerant circuit 30, but the plate heat exchanger 100 is used as the evaporator of the heat source side refrigerant circuit 30. It may be used. Of course, the plate heat exchanger 100 may be used for both the condenser and the evaporator of the heat source side refrigerant circuit 30.

  The plate-type heat exchanger according to the present invention can be used for many industrial and household devices equipped with a plate-type heat exchanger, such as power generation and food sterilization treatment equipment, in addition to the above-described air conditioner. .

  DESCRIPTION OF SYMBOLS 1 Inflow port of 1st fluid, 2 Outlet of 1st fluid, 3 Inflow port of 2nd fluid, 4 Outflow port of 2nd fluid, 5 Side plate, 6 Inner fin, 6a Base plate part, 6b Top surface part, 61 1st 1 cut and raised portion, 61a first top surface portion, 61b first leg portion, 62 second cut and raised portion, 62a second top surface portion, 62b second leg portion, 7 heat transfer plate, 7a heat transfer plate, 7b heat transfer plate , 8 groove, 8a through groove, 8b bottom groove, 9 groove, 9a outlet groove, 9b inlet groove, 11 first flow path, 12 second flow path, 30 heat source side refrigerant circuit , 31 Compressor, 32 Evaporator, 32a Blower, 33 Expansion valve, 40 Utilization side refrigerant circuit, 41 Pump, 42 Utilization side heat exchanger, 100 Plate type heat exchanger, 150 Refrigeration cycle apparatus, 200 Plate type heat exchanger (Conventional), The first fluid flow direction, B second fluid flow direction.

Claims (9)

A plurality of heat transfer plates each having a flat heat transfer surface formed between two side plates are laminated at a predetermined interval.
A first fluid inflow port and a first fluid outflow port for allowing a first fluid to flow in a space formed between the side plate and the heat transfer plate and between the heat transfer plates; A second fluid inflow port and a second fluid outflow port for allowing a second fluid different from the fluid to circulate alternately;
The first flow path through which the first fluid flows and the second flow path through which the second fluid flows are alternately formed,
At least the first flow path is a plate heat exchanger provided with an inner fin in a range facing the heat transfer surface,
In the installation range of the inner fin in the first flow path,
A concave groove having a depth smaller than the thickness of the inner fin and the heat transfer plate is formed in at least one of the range facing the heat transfer plate in the inner fin and the heat transfer plate. It is formed along the flow direction,
At least a part of the concave groove is
A plate-type heat exchanger, wherein the plate-type heat exchanger is formed by a through groove formed in the inner fin and a bottom concave groove formed in a portion of the heat transfer plate facing the through groove . In a cross section perpendicular to the longitudinal direction of the concave groove,
The plate-type heat exchanger according to claim 1, wherein the groove has a width that decreases from the opening to the bottom. In a cross section perpendicular to the longitudinal direction of the concave groove,
The plate-type heat exchanger according to claim 1, wherein the groove has a width that increases from an opening to a bottom. In the flow path in which the concave groove is formed,
One end is connected to the groove, the other end is connected to the inlet that is connected to the flow path, and the other end is connected to the groove and the other end is connected to the flow path. The plate type heat exchanger according to any one of claims 1 to 3, wherein at least one of the concave grooves on the outlet side connected to the outlet is formed. Also in the second flow path,
The inner fin is provided in a range facing the heat transfer surface,
The plate-type heat exchanger according to any one of claims 1 to 4, wherein the concave groove is formed along a flow direction of the second fluid. In the installation range of the inner fin,
6. The groove according to claim 1, wherein each of the concave grooves is formed without interruption from an upstream side to a downstream side in a flow direction of the fluid flowing through the inner fin. Plate heat exchanger.   Each of the said ditch | groove is formed in linear form, The plate type heat exchanger as described in any one of Claims 1-6 characterized by the above-mentioned.   The depth of the part formed in the said heat-transfer plate of the said concave groove is smaller than the thickness of this heat-transfer plate, The Claim 1 characterized by the above-mentioned. Plate heat exchanger. A refrigeration cycle apparatus comprising the plate heat exchanger according to any one of claims 1 to 8 .

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